Environment: Linux; real T3 development server; Claude Code CLI with Haiku; synthetic replay history; no live database.
Side: base
Commit: 39f465a926ca95496708f798a823600e07fe6060

Direct HTTP MCP calls (thread-bound agent session):
[
  {
    "label": "default",
    "arguments": {},
    "textCharacters": 8330,
    "jsonCharacters": 8330,
    "totalItems": 3234,
    "returnedItems": 10,
    "firstPosition": 0,
    "lastPosition": 811,
    "earlierPosition": null,
    "nextPosition": 811,
    "hasMore": true,
    "chronological": true
  },
  {
    "label": "activity-1500",
    "arguments": {
      "view": "activity",
      "limit": 100,
      "maxCharsPerItem": 1500
    },
    "textCharacters": 61414,
    "jsonCharacters": 61414,
    "totalItems": 3234,
    "returnedItems": 100,
    "firstPosition": 0,
    "lastPosition": 99,
    "earlierPosition": null,
    "nextPosition": 99,
    "hasMore": true,
    "chronological": true
  },
  {
    "label": "activity-1",
    "arguments": {
      "view": "activity",
      "limit": 100,
      "maxCharsPerItem": 1
    },
    "textCharacters": 54025,
    "jsonCharacters": 54025,
    "totalItems": 3234,
    "returnedItems": 100,
    "firstPosition": 0,
    "lastPosition": 99,
    "earlierPosition": null,
    "nextPosition": 99,
    "hasMore": true,
    "chronological": true
  },
  {
    "label": "explicit-start",
    "error": "{\"code\":-32602,\"message\":\"Invalid parameters for tool 't3_thread_read': Expected a value greater than or equal to 0\\n  at [\\\"afterPosition\\\"]\"}"
  }
]

Actual Claude Code tool invocation and observed result:
{"type": "tool_use", "id": "toolu_01Vs8C9GwEaZXG7HGo9u9WN8", "name": "ToolSearch", "input": {"query": "select:mcp__proof__t3_thread_read", "max_results": 1}, "caller": {"type": "direct"}}
{"type": "tool_use", "id": "toolu_01W18eGtWPcqRyA8GQmMH9Q4", "name": "mcp__proof__t3_thread_read", "input": {"threadId": "mcp:54b86edc-d5d4-4ea6-9c3e-fc43c1c4738d", "view": "activity", "limit": 100, "maxCharsPerItem": 1}, "caller": {"type": "direct"}}
{"tool_use_id": "toolu_01W18eGtWPcqRyA8GQmMH9Q4", "type": "tool_result", "content": "Error: result (54,025 characters) exceeds maximum allowed tokens. Output has been saved to <private-local-path>\nFormat: JSON with schema: {thread: {threadId: string, projectId: string, title: string, link: string, createdBy: string, creationSource: string, status: string, latestRunId: string, activeRunId: string, providerInstanceId: string, ...}, recentRuns: [{...}], items: [{...}], nextPosition: number, hasMore: boolean}\nUse jq to make structured queries (find a value, filter by field).\nREQUIREMENTS FOR SUMMARIZATION/ANALYSIS/REVIEW:\n- You MUST read the content from the file at <private-local-path> in sequential chunks until 100% of the content has been read.\n- Note: this file is JSON, so a long value (or the whole file) is a single line. Read's offset/limit cannot split a line, so reading in chunks works only if every line is short. If a shell tool is available, first probe the structure (e.g., jq 'type, length, keys?' <private-local-path> then extract slices with jq or python.\n- If you receive truncation warnings when reading the file, reduce the chunk size until you have read 100% of the content without truncation.\n- Before producing ANY summary or analysis, you MUST explicitly describe what portion of the content you have read. ***If you did not read the entire content, you MUST explicitly state this.***\n- If after a few attempts you cannot read the file (file not found, lines too long for Read's offset/limit, no shell access), STOP retrying. Summarize what you were able to read, explicitly state which portion you could not read and why, and proceed.\n"}
The tool result was saved to a file because of its size. The call returned an error: the output was 54,025 characters, over the maximum allowed tokens, so it was written to `<private-local-path>`.

The error text also asked me to read that file in chunks. You told me not to read any files, so I didn't. I made no other calls besides loading the tool's schema through ToolSearch.